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NVD / CVE Program· CNA Linux

CVE-2026-68141: net/af_iucv: fix NULL deref in afiucv_hs_callback_syn()

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.52% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 07e21deb3664001995e0a456dd627ab7dbe127ec, 0e857185591fe79934427c9c0c1c31dc776be134, 33736ff5e7c97d3348ce812e8bd2e125d840743c; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 07e21deb3664001995e0a456dd627ab7dbe127ec, 0e857185591fe79934427c9c0c1c31dc776be134, 33736ff5e7c97d3348ce812e8bd2e125d840743c; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: net/af_iucv: fix NULL deref in afiucv_hs_callback_syn() afiucv_hs_callback_syn() allocates the child socket with GFP_ATOMIC. If the allocation fails, nsk is NULL. The connection-refused path is entered when the listen state check fails, the accept backlog is full, or nsk is NULL. The code unconditionally calls iucv_sock_kill(nsk) in that path. iucv_sock_kill() does not accept a NULL socket pointer and immediately dereferences sk via sock_flag(sk, SOCK_ZAPPED). When nsk is NULL, calling iucv_sock_kill(nsk) results in a NULL pointer dereference. Only call iucv_sock_kill() when a child socket was successfully allocated.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Aug 10, 2026
Updated
Oct 19, 2026
EPSS
0.5% · 44th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-68141

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.2affected
    • 3881ac441f642d56503818123446f7298442236b and later · before 6a1eb5b46c19073f8153b7e2c19b408cf353aaf1affected · git
    • 3881ac441f642d56503818123446f7298442236b and later · before c0b6e2ae90613c2fea7eaf3faa20985c6c2a1953affected · git
    • 3881ac441f642d56503818123446f7298442236b and later · before 07e21deb3664001995e0a456dd627ab7dbe127ecaffected · git
    • 3881ac441f642d56503818123446f7298442236b and later · before 8bb111f87ded6acb9837ec9b45d6f02cda94c51faffected · git
    • 3881ac441f642d56503818123446f7298442236b and later · before 46453b16f38ec7147351f7447e2aec6ea330f7b3affected · git
    • 3881ac441f642d56503818123446f7298442236b and later · before 33736ff5e7c97d3348ce812e8bd2e125d840743caffected · git
    • 3881ac441f642d56503818123446f7298442236b and later · before 0e857185591fe79934427c9c0c1c31dc776be134affected · git
    • 3881ac441f642d56503818123446f7298442236b and later · before 47a5116e56a6b6fe1e909f244e39cd0fc26ceee4affected · git
    • before 3.2not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.101-1~deb12u16.12.101-1~deb12u1
Debian:13linuxbefore 6.12.101-16.12.101-1
Debian:14linuxbefore 7.1.6-17.1.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-68138Aug 10, 2026 · net/sched: serialize qdisc_rtab_list against concurrent get/put
    31Monitor
  • ← EarlierCVE-2026-68140Aug 10, 2026 · net/iucv: fix use-after-free of a severed iucv_path
    35Monitor
  • Later →CVE-2026-68142Aug 10, 2026 · geneve: require CAP_NET_ADMIN in the device netns for changelink
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux07e21deb3664001995e0a456dd627ab7dbe127ecVendor (CNA)
Linux Linux0e857185591fe79934427c9c0c1c31dc776be134Vendor (CNA)
Linux Linux33736ff5e7c97d3348ce812e8bd2e125d840743cVendor (CNA)
Linux Linux46453b16f38ec7147351f7447e2aec6ea330f7b3Vendor (CNA)
Linux Linux47a5116e56a6b6fe1e909f244e39cd0fc26ceee4Vendor (CNA)
Linux Linux6a1eb5b46c19073f8153b7e2c19b408cf353aaf1Vendor (CNA)
Linux Linux8bb111f87ded6acb9837ec9b45d6f02cda94c51fVendor (CNA)
Linux Linuxc0b6e2ae90613c2fea7eaf3faa20985c6c2a1953Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-681360 days apartnet: gro: fix double aggregation of flush-marked skbs
    39Monitor
  • CVE-2026-683850 days aparts390/checksum: Fix csum_partial() without vector facility
    39Monitor
  • CVE-2026-683540 days apartfirewire: net: Fix fragmented datagram reassembly
    35Monitor
  • CVE-2025-68818209 days apartscsi: Revert "scsi: qla2xxx: Perform lockless command completion in abort path"
    35Monitor
  • CVE-2026-720355 days apartnet/sched: sch_taprio: Replace direct dequeue call with peek and qdisc_dequeue_peeked
    32Monitor
  • CVE-2026-683050 days apartdrm/xe/vf: Add drm_dev guards when detaching CCS read/write buffers
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records